Mitsubishi Electric L02SCPU User's Manual And Reference page 38

(1) Handling
(a) Power-off during online data operation (including reset)
Files in memory are not discarded if the CPU module is powered off or reset during online operation.
However, for SD memory cards, doing so may result in data corruption. Stop accessing to an SD memory card,
and then power off or reset the CPU module. All of SD memory card operations can be disabled by SM606 (SD
memory card forced disable instruction). For the forced disablement of SD card, refer to the following.
MELSEC-L CPU Module User's Manual (Hardware Design, Maintenance and Inspection)
(b) Simultaneous writing to the same file from multiple programming tools
While a file is being written, accessing the file from another programming tool is not allowed. Also, while a file is
being accessed, writing data to the file from another programming tool is not allowed.
To write data to the same file from multiple programming tools, perform one by one.
(c) Simultaneous accessing to different files from multiple programming tools
Up to ten different files in a CPU module can be simultaneously accessed from multiple programming tools.
(d) File access into the SD memory card
Accessing into the SD memory card with the SP.FREAD or SP.FWRITE instruction may extend the scan time
as the number of files stored in the SD memory card increases.
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